Hibernate broken on old Sony Vaio PCG-FX501

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I've just installed Xubuntu Hardy on an old Sony Vaio PCG-FX501. It hibernates, but resume hangs without any error message when you'd expect X to start. I've tried to kill gdm and then reboot, but nothing changes. Hibernate used to work on Ubuntu feisty, I don't know with Gutsy because I skipped it.

[perce]

The last message before hanging was:


suspending console(s)


Following some advise found on the LKML I added the line"


no_console_suspend

to the kernel line in grub. Now resume goes a little further, but hangs at:


Disabling non-boot CPUs


The strange thing is that it is an old laptop with only one CPU.
I'm using the kernel:


2.6.24-19-generic SMP
Is there a way to boot a non SMP kernel, just to try?